Endress+Hauser Deltabar FMD71 User manual

Products Solutions Services
Operating Instructions
Deltabar FMD71, FMD72
Level measurement with electronic differential pressure
Electronic differential pressure transmitter with ceramic
and metal sensors
BA01044P/00/EN/06.17
71376028
Valid as of version
01.00.00

Deltabar FMD71, FMD72
2 Endress+Hauser
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0023555
• Make sure the document is stored in a safe place such that it is always available when
working on or with the device.
• To avoid danger to individuals or the facility, read the "Basic safety instructions" section
carefully, as well as all other safety instructions in the document that are specific to
working procedures.
• The manufacturer reserves the right to modify technical data without prior notice. Your
Endress+Hauser distributor will supply you with current information and updates to
these Instructions.

Deltabar FMD71, FMD72 Table of contents
Endress+Hauser 3
Table of contents
1 Document information .............. 5
1.1 Document function ..................... 5
1.2 Symbols used .......................... 5
1.3 Documentation ........................ 6
1.4 Terms and abbreviations ................. 8
1.5 Turn down calculation ................... 9
1.6 Registered trademarks ................... 9
2 Basic safety instructions ........... 10
2.1 Requirements concerning the staff ......... 10
2.2 Designated use ....................... 10
2.3 Workplace safety ...................... 11
2.4 Operational safety ..................... 11
2.5 Product safety ........................ 11
3 Product description ................ 12
3.1 Product design ........................ 12
3.2 Function ............................ 13
4 Incoming acceptance and product
identification ..................... 14
4.1 Incoming acceptance ................... 14
4.2 Product identification ................... 15
4.3 Nameplates .......................... 15
4.4 Storage and transport .................. 17
5 Installation ....................... 18
5.1 Mounting dimensions .................. 18
5.2 Mounting location ..................... 18
5.3 Orientation .......................... 18
5.4 General installation instructions ........... 18
5.5 Thermal insulation - FMD71 high-
temperature version .................... 19
5.6 Installing the sensor modules ............. 20
5.7 Mounting sensor modules with PVDF
installation coupling ................... 20
5.8 Installing the transmitter ................ 21
5.9 Closing the housing cover ................ 22
5.10 Seal for flange mounting ................ 23
5.11 Post-installation check .................. 23
6 Electrical connection .............. 24
6.1 Connecting the sensor module LP to the
sensor module HP ..................... 24
6.2 Connecting the sensor module HP to the
transmitter .......................... 25
6.3 Connecting the measuring unit ............ 26
6.4 Connection conditions .................. 27
6.5 Connection data ....................... 28
6.6 Post-connection check .................. 29
7 Operation options ................. 30
7.1 Operation without operating menu ......... 30
7.2 Operation with an operating menu ......... 32
7.3 Structure of the operating menu ........... 32
7.4 Operating options ..................... 33
7.5 Operating the device using onsite display
(optional) ........................... 33
7.6 Operation using Endress+Hauser operating
program ............................ 36
7.7 Direct access to parameters .............. 37
7.8 Locking/unlocking operation ............. 37
7.9 Resetting to factory settings (reset) ........ 38
8Integrating transmitter via HART®
protocol .......................... 40
8.1 HART process variables and measured
values .............................. 40
8.2 Device variables and measured values ....... 41
9 Commissioning .................... 42
9.1 Post-installation check and function check ... 42
9.2 Unlocking/locking configuration .......... 42
9.3 Commissioning without an operating menu .. 42
9.4 Commissioning with an operating menu ..... 45
9.5 Language selection .................... 45
9.6 Measuring mode selection ............... 46
9.7 Selecting the high-pressure side ........... 46
9.8 Pressure unit selection .................. 47
9.9 Pos. zero adjust ....................... 47
9.10 Configuring level measurement ........... 48
9.11 Linearization ......................... 58
9.12 Configuring pressure measurement ........ 61
9.13 Backing up or duplicating the device data .... 63
9.14 Configuring the local display ............. 64
9.15 Protecting settings from unauthorized
access .............................. 64
10 Diagnostics and troubleshooting ... 65
10.1 Troubleshooting ...................... 65
10.2 Diagnostic events ...................... 65
10.3 Response of output to errors .............. 69
10.4 Firmware history ...................... 70
10.5 Disposal ............................ 70
11 Maintenance ...................... 71
11.1 Information on cleaning ................. 71
11.2 Exterior cleaning ...................... 71
12 Repairs ........................... 72
12.1 General notes ........................ 72
12.2 Spare parts .......................... 73

Table of contents Deltabar FMD71, FMD72
4 Endress+Hauser
12.3 Return .............................. 73
13 Overview of the operating menu .... 74
14 Description of Device Parameters ... 78
14.1 Language ........................... 78
14.2 Display/operat. ....................... 78
14.3 Setup .............................. 80
14.4 Setup → Extended Setup ................. 85
14.5 Setup → Extended Setup → Level ("Level"
measuring mode) ...................... 86
14.6 Setup → Extended Setup → Linearization .... 91
14.7 Setup → Extended Setup → Current output ... 93
14.8 Diagnostics .......................... 97
14.9 Diagnosis → Sensor HP .................. 97
14.10 Diagnosis → Sensor LP .................. 99
14.11 Diagnostic → Diagnostic list ............. 100
14.12 Diagnosis → Event logbook .............. 100
14.13 Diagnosis → Instrument info ............ 101
14.14 Diagnosis → Sens. limit HP .............. 104
14.15 Diagnosis → Sens. limit LP .............. 104
14.16 Diagnosis → Measured Values ........... 105
14.17 Diagnosis → Simulation ................ 107
14.18 Diagnosis → Reset .................... 110
15 Technical data ................... 112
15.1 Input .............................. 112
15.2 Output ............................ 115
15.3 Performance characteristics of ceramic
process isolating diaphragm ............. 118
15.4 Performance characteristics of metallic
process isolating diaphragm ............. 123
15.5 Environment ........................ 128
15.6 Process ............................ 129
15.7 Additional technical data ............... 130
Index ................................. 131

Deltabar FMD71, FMD72 Document information
Endress+Hauser 5
1 Document information
1.1 Document function
These Operating Instructions contain all the information that is required in various phases
of the life cycle of the device: from product identification, incoming acceptance and
storage, to mounting, connection, operation and commissioning through to
troubleshooting, maintenance and disposal.
1.2 Symbols used
1.2.1 Safety symbols
Symbol Meaning
DANGER
DANGER!
This symbol alerts you to a dangerous situation. Failure to avoid this situation will
result in serious or fatal injury.
WARNING
WARNING!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can
result in serious or fatal injury.
CAUTION
CAUTION!
This symbol alerts you to a dangerous situation. Failure to avoid this situation can
result in minor or medium injury.
NOTICE
NOTE!
This symbol contains information on procedures and other facts which do not result in
personal injury.
1.2.2 Electrical symbols
Symbol Meaning
Direct current
Alternating current
Direct current and alternating current
Ground connection
A grounded terminal which, as far as the operator is concerned, is grounded via a
grounding system.
Protective Earth (PE)
A terminal which must be connected to ground prior to establishing any other
connections.
The ground terminals are situated inside and outside the device:
• Inner ground terminal: Connects the protectiv earth to the mains supply.
• Outer ground terminal: Connects the device to the plant grounding system.
1.2.3 Tool symbols
Symbol Meaning
A0011220
Flat blade screwdriver
A0011219
Phillips head screwdriver

Document information Deltabar FMD71, FMD72
6 Endress+Hauser
Symbol Meaning
A0011221
Allen key
A0011222
Open-ended wrench
1.2.4 Symbols for certain types of information
Symbol Meaning
Permitted
Procedures, processes or actions that are permitted.
Preferred
Procedures, processes or actions that are preferred.
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information.
Reference to documentation
A
Reference to page
Reference to graphic
Visual inspection
1.2.5 Symbols in graphics
Symbol Meaning
1, 2, 3 ... Item numbers
,… ,
1. 2. 3.
Series of steps
A, B, C, ... Views
A-A, B-B, C-C, ... Sections
1.3 Documentation
The document types listed are available:
In the Download Area of the Endress+Hauser Internet site: www.endress.com →
Download
1.3.1 Technical Information (TI): planning aid for your device
TI01033P:
The document contains all the technical data on the device and provides an overview of
the accessories and other products that can be ordered for the device.
1.3.2 Brief Operating Instructions (KA): getting the 1st measured
value quickly
KA01105P:

Deltabar FMD71, FMD72 Document information
Endress+Hauser 7
The Brief Operating Instructions contain all the essential information from incoming
acceptance to initial commissioning.
1.3.3 Description of Device Parameters (GP): reference for your
parameters
GP01013P:
The document provides a detailed explanation of each individual parameter in the
operating menu. The description is aimed at those who work with the device over the
entire life cycle and perform specific configurations.
1.3.4 Safety Instructions (XA)
Safety Instructions (XA) are supplied with the device depending on the approval. These
instructions are an integral part of the Operating Instructions.
Device Directive Documentation Option 1)
FMD71, FMD72 ATEX II 1/2G Ex ia IIC T6 Ga/Gb XA00619P BA
FMD71, FMD72 ATEX II 1/2G Ex d [ia] IIC T6 Ga/Gb XA00620P BC
FMD71, FMD72 ATEX II 3G Ex nA IIC T6 GC XA00621P BD
FMD71, FMD72 IEC Ex ia IIC T6 Ga/Gb XA00622P IA
FMD71, FMD72 IEC Ex d [ia] IIC T6 Ga/Gb XA00623P IB
FMD71, FMD72 CSA General Purpose - CD
FMD71, FMD72 NEPSI Ex ia IIC T4/T6 Ga/Gb XA01352P NA
FMD71, FMD72 NEPSI Ex d [ia] IIC T4/T6 Ga/Gb XA01353P NB
FMD71, FMD72 INMETRO Ex ia IIC T6...T4 Ga/Gb XA01378P MA
FMD71, FMD72 INMETRO Ex d [ia] IIC T6...T4 Ga/Gb XA01379P MC
FMD71, FMD72 EAC Ga/Gb Ex ia IIC T6...T4 XA01594P GA
FMD71, FMD72 EAC Ga/Gb Ex d [ia] IIC T6...T4 X XA01595P GB
FMD71 FM C/US IS Cl.I Div.1 Gr.A-D, AEx ia, Zone 0,1,2 XA00628P FA
FMD71 FM C/US XP AIS Cl.I Div.1 Gr.A-D, Exd [ia] Zone 0,1,2 XA00629P FB
FMD71 CSA C/US XP Cl.I Div.1 Gr.A-D, Ex d [ia], Zone 0,1,2 XA00631P CB
FMD71 FM C/US NI Cl.I Div.2 Gr.A-D, Zone 2 XA00668P FD
FMD71 CSA C/US NI, Cl.I Div. 2, Gr.A-D Cl.I, Zone 2, IIC XA00670P CC
FMD71 CSA C/US IS Cl.I Div.1 Gr.A-D, Ex ia Zone 0,1,2 XA00630P CA
FMD72 CSA C/US IS Cl.I Div.1 Gr.A-D, Ex ia Zone 0,1,2 XA00626P CA
FMD72 CSA C/US XP Cl.I Div.1 Gr.A-D, Ex d [ia], Zone 0,1,2 XA00627P CB
FMD72 CSA C/US NI, Cl.I Div.2 Gr.A-D, Zone 2 XA00671P CC
FMD72 FM C/US IS Cl.I Div.1 Gr.A-D, AEx ia, Zone 0,1,2 XA00624P FA
FMD72 FM C/US XP AIS Cl.I Div.1 Gr.A-D, Exd [ia] Zone 0,1,2 XA00625P FB
FMD72 FM C/US NI Cl.I Div.2 Gr.A-D, Zone 2 XA00669P FD
1) Product Configurator order code for "Approval"
The nameplate provides information on the Safety Instructions (XA) that are relevant
for the device.

Document information Deltabar FMD71, FMD72
8 Endress+Hauser
1.4 Terms and abbreviations
URL OPLMWP
LRL
0
p
LRV URV
1
2
3
4
A0029505
Position Term/
abbreviation
Explanation
1 OPL The OPL (over pressure limit = sensor overload limit) for the measuring device
depends on the lowest-rated element, with regard to pressure, of the selected
components, i.e. the process connection has to be taken into consideration in
addition to the measuring cell. Also observe pressure-temperature dependency.
For the relevant standards and additional notes, see the "Pressure specifications"
section →  130.
The OPL may only be applied for a limited period of time.
2 MWP The MWP (maximum working pressure) for the sensors depends on the lowest-
rated element, with regard to pressure, of the selected components, i.e. the
process connection has to be taken into consideration in addition to the
measuring cell. Also observe pressure-temperature dependency. For the
relevant standards and additional notes, see the "Pressure specifications" section
→  130.
The MWP may be applied at the device for an unlimited period.
The MWP can also be found on the nameplate.
3 Maximum sensor
measuring range
Span between LRL and URL
This sensor measuring range is equivalent to the maximum calibratable/
adjustable span.
4 Calibrated/
adjusted span
Span between LRV and URV
Factory setting: 0 to URL
Other calibrated spans can be ordered as customized spans.
p - Pressure
- LRL Lower range limit
- URL Upper range limit
- LRV Lower range value
- URV Upper range value
- TD (Turn down) Turn down
Example - see the following section.

Deltabar FMD71, FMD72 Document information
Endress+Hauser 9
1.5 Turn down calculation
LRV URLURV LRL
1 = 2 3
A0029545
1 Calibrated/adjusted span
2 Zero point-based span
3 URL sensor
Example
• Sensor:10 bar (150 psi)
• Upper range value (URL) = 10 bar (150 psi)
Turn down (TD):
• Calibrated/adjusted span: 0 to 5 bar (0 to 75 psi)
• Lower range value (LRV) = 0 bar (0 psi)
• Upper range value (URV) = 5 bar (75 psi)
TD = URL
|URV - LRV|
TD = 10 bar (150 psi) = 2
|5 bar (75 psi) - 0 bar (0 psi)|
In this example, the TD is 2:1.
This span is based on the zero point.
1.6 Registered trademarks
1.6.1 HART®
Registered trademark of the FieldComm Group, Austin, USA

Basic safety instructions Deltabar FMD71, FMD72
10 Endress+Hauser
2 Basic safety instructions
2.1 Requirements concerning the staff
The personnel for installation, commissioning, diagnostics and maintenance must fulfill
the following requirements:
‣Trained, qualified specialists: must have a relevant qualification for this specific
function and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣Before beginning work, the specialist staff must have read and understood the
instructions in the Operating Instructions and supplementary documentation as well as
in the certificates (depending on the application)
‣Following instructions and basic conditions
The operating personnel must fulfill the following requirements:
‣Being instructed and authorized according to the requirements of the task by the
facility's owner-operator
‣Following the instructions in these Operating Instructions
2.2 Designated use
2.2.1 Application and media
The Deltabar FMD72 is a differential pressure transmitter for measuring differential
pressure and level in pressurized tanks. The device has two sensor modules, which
measure the operating pressure (High Pressure HP and Low Pressure LP). The differential
pressure/hydrostatic level is calculated in the transmitter unit. The sensor signal is
transmitted digitally. In addition, sensor temperatures and the individual process pressures
present at the respective sensor modules can be individually evaluated and transmitted. If
the limit values specified in the "Technical Data" and the conditions listed in the
instructions and additional documentation are observed, the measuring device may be
used for the following measurements (process variables):
Measured process variables
• Pressure HP and Pressure LP
• Sensor temperature HP and sensor temperature LP
• Transmitter temperature
Calculated process variables
• Differential pressure
• Level (level, volume or mass)
2.2.2 Incorrect use
The manufacturer is not liable for damage caused by improper or non-designated use.
Verification for borderline cases:
‣For special fluids and fluids for cleaning, Endress+Hauser is glad to provide assistance
in verifying the corrosion resistance of fluid-wetted materials, but does not accept any
warranty or liability.
2.2.3 Residual risks
Due to heat transfer from the process as well as power loss in the electronics, the
temperature of the electronics housing and the assemblies contained therein (e.g. display

Deltabar FMD71, FMD72 Basic safety instructions
Endress+Hauser 11
module, main electronics module and I/O electronics module) may rise up to 80 °C
(176 °F). When in operation, the sensor can reach a temperature close to the medium
temperature.
Danger of burns from contact with surfaces!
‣For elevated fluid temperature, ensure protection against contact to prevent burns.
2.3 Workplace safety
For work on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
‣Switch off the supply voltage before connecting the device.
2.4 Operational safety
Risk of injury!
‣Operate the device in proper technical condition and fail-safe condition only.
‣The operator is responsible for interference-free operation of the device.
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers.
‣If, despite this, modifications are required, consult with Endress+Hauser.
Repairs
To ensure continued operational safety and reliability,
‣Carry out repairs on the device only if they are expressly permitted.
‣Observe federal/national regulations pertaining to repair of an electrical device.
‣Use original spare parts and accessories from Endress+Hauser only.
Hazardous area
To eliminate danger to persons or the facility when the device is used in the approval-
related area (e.g. explosion protection, pressure vessel safety):
‣Check the nameplate to verify if the device ordered can be put to its intended use in the
approval-related area.
‣Observe the specifications in the separate supplementary documentation that is an
integral part of these Instructions.
2.5 Product safety
This measuring device is designed in accordance with good engineering practice to meet
state-of-the-art safety requirements, has been tested, and left the factory in a condition in
which it is safe to operate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser
confirms this by affixing the CE mark to the device.

Product description Deltabar FMD71, FMD72
12 Endress+Hauser
3 Product description
3.1 Product design
Level measurement (level, volume and mass) with Deltabar:
LP 1
HP
p1
p2
P = p2
LP
P = p1 + p2
HP
A0016449
LP Sensor module LP (low pressure)
HP Sensor module HP (high pressure)
p2 Head pressure
p1 Hydrostatic pressure
1 Transmitter
The FMD71/FMD72 is best suited to level measurement in vessels with pressure overlay
or in vacuum vessels and tanks, high distillation columns and other vessels with changing
ambient temperatures.
The sensor module HP is mounted on the lower measuring connection and the sensor
module LP is mounted above the maximum level. The transmitter can be mounted on
pipes or walls with the mounting bracket.
The sensor signal is transmitted digitally. In addition, sensor temperatures and the
individual process pressures present at the respective sensor modules can be individually
evaluated and transmitted.
NOTICE
Incorrect sizing/order of sensor modules
‣In a closed system, please note that the sensor module is affected by the superimposed
head pressure (p2) in addition to the hydrostatic pressure (p1). This must be taken into
account when sizing the sensor module on the high-pressure side (HP).

Deltabar FMD71, FMD72 Product description
Endress+Hauser 13
3.2 Function
3.2.1 Differential pressure generation
The measurement chain for the calculation of the differential pressure can be represented
by the following diagram:
Sensor
pressure LP
Measured
pressure LP
↑ ↑
LP →
Sensor
calibration LP →
Sensor trim LP
→
Pressure
simulation LP
Corrected
pressure
Pressure after
damping
Measured
differential
pressure
↓↑ ↑ ↑
Differential
pressure +
pressure
inversion
→
Position
adjustment
(calib. offset)
→
Differential
pressure
simulation
→ Damping → P
↑
HP →Sensor
calibration HP →Sensor trim HP →Pressure simulation HP
↓ ↓
Sensor
pressure HP
Measured
pressure HP
All the process values represented on the diagram are updated in a measurement cycle.
The sensor module allocation is determined by the configuration when setting up the
device. The connection to the transmitter defines the corresponding sensor module as the
master. After commissioning, the second sensor module is detected as the slave. This
configuration can be modified as desired. However, a modification must take place with
the unit disconnected from the power supply.
The sensor modules have a designation independent of the master/slave configuration.
This indicates where the sensor module is typically installed:
• Sensor module LP
LP = Low pressure; top
• Sensor module HP
HP = High pressure; bottom
For identical sensor module ranges, this assignment can likewise be changed, but this then
has to be configured in the menu.
If you change both sensor modules or the electronics, this allocation must likewise be
carried out. See the "Transm. connect. (286)" parameter .

Incoming acceptance and product identification Deltabar FMD71, FMD72
14 Endress+Hauser
4 Incoming acceptance and product
identification
4.1 Incoming acceptance
A0028673
DELIVERY NOTE
1 = 2
A0016870
Is the order code on the delivery note (1) identical to the order code on
the product sticker (2)?
A0016052
A0028673
A0016053
Are the goods undamaged?
A0028673
DELIVERY NOTE
Span
Ser. no.:
Order code:
P
U:
Deltabar
Ext. order code:
Order Code:
Ser.-No.:
MWP
Span
U=
Mat. -
Dat.:
0044
Mat.:
P
Ser. no.:
MWP
Sensor module Deltabar
A0016054
Do the data on the nameplate correspond to the order specifications and
the delivery note?

Deltabar FMD71, FMD72 Incoming acceptance and product identification
Endress+Hauser 15
A0028673
A0022106
Is the documentation provided?
If required (see nameplate): Are the safety instructions (XA) present?
If one of these conditions is not fulfilled, please contact your
Endress+Hauser sales office.
4.2 Product identification
The following options are available for identification of the measuring device:
• Nameplate specifications
• Order code with breakdown of the device features on the delivery note
• Enter serial numbers from nameplates in W@M Device Viewer
(www.endress.com/deviceviewer): All information about the measuring device is
displayed.
For an overview of the technical documentation provided, enter the serial number from
the nameplates in W@M Device Viewer (www.endress.com/deviceviewer)
4.2.1 Manufacturer address
Endress+Hauser GmbH+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Address of the manufacturing plant: See nameplate.
4.3 Nameplates
4.3.1 Nameplates of the T14 transmitter housing
Ser. no.:
Order code:
Ext. order code:
25
6
3
4
1
A0016056
1 Device name
2 Order code (for re-orders)
3 Extended order code (complete)
4 Technical data
5 Serial number (for identification)
6 Manufacturer address

Incoming acceptance and product identification Deltabar FMD71, FMD72
16 Endress+Hauser
Additional nameplate for devices with Ex approval
2
1
A0021222
1 Approval-specific information
2 Document number of Safety Instructions or drawing number
Additional nameplate for devices with PVDF process connection
1
A0022683
1 application limits
4.3.2 Nameplates of the T17 transmitter housing
2
7
3
4
5
6
1
Ser. no.:
Order code:
Ext. ord. cd.:
A0021552
1 Device name
2 Manufacturer address
3 Order code (for re-orders)
4 Extended order code (complete)
5 Serial number (for identification)
6 Technical data
7 Approval-related information and document number of Safety Instructions or drawing number

Deltabar FMD71, FMD72 Incoming acceptance and product identification
Endress+Hauser 17
4.3.3 Nameplate of the sensor housing
0044
Mat.:
P
Ser. no.:
MWP
Sensor module Deltabar
2
1
A0021224
1 Sensor serial number
2 Identification of sensor type (HP/LP)
4.4 Storage and transport
4.4.1 Storage conditions
Use original packaging.
Store the measuring device in clean and dry conditions and protect from damage caused by
shocks (EN 837-2).
Storage temperature range
–40 to +80 °C (–40 to +176 °F)
4.4.2 Transporting the product to the measuring point
LWARNING
Incorrect transport!
Housing and diaphragm may become damaged, and there is a risk of injury!
‣Transport the measuring device to the measuring point in its original packaging or by
the process connection.
‣Follow the safety instructions and transport conditions for devices weighing more than
18 kg (39.6 lbs).
A0016058

Installation Deltabar FMD71, FMD72
18 Endress+Hauser
5 Installation
• Moisture must not penetrate the housing when mounting the device, establishing the
electrical connection and during operation.
• When measuring in media containing solids, such as dirty liquids, installing separators
and drain valves is useful for capturing and removing sediment.
• Do not clean or touch process isolating diaphragms with hard and/or pointed objects.
• Do not remove process isolating diaphragm protection until shortly before installation.
• Always firmly tighten the housing cover and the cable entries.
• Point the cable and connector downwards where possible to prevent moisture from
entering (e.g. rain or condensation water).
5.1 Mounting dimensions
For dimensions, see the "Mechanical construction" section in the Technical Information.
5.2 Mounting location
The FMD71/FMD72 is best suited to level measurement in vessels with pressure overlay
or in vacuum vessels and tanks, high distillation columns and other vessels with changing
ambient temperatures.
The sensor module HP is mounted on the lower measuring connection and the sensor
module LP is mounted above the maximum level. The transmitter can be mounted on
pipes or walls with the mounting bracket.
5.3 Orientation
• Transmitter: Any orientation.
• Sensor modules: The orientation can cause a zero point shift .
This position-dependent zero point shift can be corrected directly at the device via the
operating key, and also in hazardous areas in the case of devices with external operation
(position adjustment).
5.4 General installation instructions
Mounting the sensor modules and transmitter is very easy
• The housings of the sensor modules can be rotated up to 360°.
• The transmitter is freely rotatable in the mounting bracket.
The sensor modules and transmitter can be easily aligned when mounted.
Your benefits
• Easy mounting due to optimum alignment of housing
• Easily accessible device operation
• Optimum readability of the onsite display (optional)
• Easy pipe installation due to optional alignment of the modules.

Deltabar FMD71, FMD72 Installation
Endress+Hauser 19
2 mm
3 mm
A0017506
5.5 Thermal insulation - FMD71 high-temperature
version
The FMD71 high-temperature version may only be insulated up to a certain height. The
maximum permitted insulation height is indicated on the devices and applies to an
insulation material with a heat conductivity ≤ 0.04 W/(m x K) and to the maximum
permitted ambient and process temperature. The insulation height is not indicated on
hygienic connections.
• Ambient temperature (TA): ≤ 70 °C (158 °F)
• Process temperature (TP): ≤ 150 °C (302 °F)
The data were determined under the most critical application "quiescent air".
A
B
1 2
A0021075
A Ambient temperature
B Process temperature
1 Insulation height
2 Insulation material

Installation Deltabar FMD71, FMD72
20 Endress+Hauser
5.6 Installing the sensor modules
5.6.1 General installation instructions
• The nameplate on the sensor module specifies where the sensor module is typically
installed:
HP (bottom)
LP (top)
For further information, see the "Function" section →  13.
• Due to the orientation of the sensor modules, there may be a shift in the zero point, i.e.
when the vessel is empty or partially full, the measured value does not display zero.
You can correct this zero point shift: see the "Commissioning without an operating menu"
→  42or the "Position adjustment"→  47 section.
• Always install the sensor module HP below the lowest measuring point.
• Always install the sensor module LP above the highest measuring point.
• Do not mount the sensor modules in the filling curtain or at a point in the tank which
could be affected by pressure pulses from an agitator.
• Do not mount the sensor modules in the suction area of a pump.
• The adjustment and functional test can be carried out more easily if you mount the
sensor modules downstream of a shutoff device.
• If a heated sensor module is cooled during the cleaning process (e.g. by cold water), a
vacuum develops for a short time, whereby moisture can penetrate the sensor through
the pressure compensation (3). If this is the case, mount the sensor with the pressure
compensation (3) pointing downwards.
• Keep the pressure compensation and GORE-TEX® filter (3) free from contamination.
• Do not clean or touch process isolating diaphragms with hard or pointed objects.
2
3
1
A0017512
5.7 Mounting sensor modules with PVDF installation
coupling
LWARNING
Risk of damage to process connection!
Risk of injury!
‣Sensor modules with PVDF process connections with threaded connection must be
installed with the mounting bracket provided!